(66) is A onE-wAy FunCtion thAt tAkEs An ArBitrArily long piECE oF plAintExt AnD From it ComputEs A FixED-lEngth Bit string. (67) is A protoCol thAt most usEnEt mAChinEs how usE it to Allow nEws ArtiClEs to propAgAtE From onE mAChinE to AnothEr ovEr A rEliABlE ConnECtion. (68) is An ApproACh prEFErrED By CABlE tv proviDErs. in this solution thE FiBEr tErminAtEs At An optoElECtriCAl ConvErtEr AnD thE FinAl sEgmEnt is A shArED CoAxiAl CABlE. (69) is A DEviCE usED to ConnECt two sEpArAtE nEtwork thAt usE DiFFErEnt CommuniCAtion protoCol. (70) js A DigitAl-to-DigitAl polAr EnCoDing mEthoD in whiCh thE signAl lEvEl is AlwAys EithEr positivE or nEgAtivE.
ADsl
B．FttC
C、hFC
D．Ftth